alias2related( alias )
    Returns aliases related to a specified alias.

    Parameters
    ----------
    alias: any
        Alias (an object path string or reference).

    Returns
    -------
    out: Array|undefined
        Related aliases.

    Examples
    --------
    > var v = alias2related( 'base.sin' )
    [...]


alias2related( instance )
    Returns aliases associated with a provided class instance.

    Only direct instances of documented built-in constructors are supported.

    Parameters
    ----------
    instance: any
        Class instance.

    Returns
    -------
    out: Array|undefined
        Related aliases.

    Examples
    --------
    > var v = alias2related( new Float64Array( 10 ) )
    [...]

    See Also
    --------
    alias2pkg, aliases, pkg2related